Answers

And you're right - the keyboard was miserable to fix, but it's done. Edit: The Keyboard has been replaced, but it is not fixed. There have been several false fixes, and Lewis claims it works fine when booted from his version of Maverick on their bench hard drive. I've tried it under Maverick, Yosemite, and El Capitan with the same result; q, w, e, r, t, y, u, and i keys fail when the system begins to warm up. I had thought the system was running hot, but an SMC reset seems to have helped that. The keyboard is new, Louis has given the motherboard a clean bill of health, so I'm out of ideas.

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Before trying all of this, I took all the software steps Apple recommends, even wiping and reloading the iPhone. Still needed the vibrator transplant, and now it works great!

Rather than remove the screen, I placed the phone in a small plastic basket and used a chip-clip to hold the screen to the side of the basket. This had the added benefit of catching the small parts I fumbled and saving a couple of rounds of magnet sweeps across the floor trying to find teeny-tiny screws. Thanks for another well done tutorial!

I'm going to try it this way, because the odds of damaging the connector during removal seem greater than the risk of ripping the cable, however, I plan to cradle the phone in the "L" of simple, sheet metal bookend, and secure it using blue painter's tape. Seems more stable.